Sometimes airport parking is insanely expensive (cough Schipol), so I'll park further away anyway or park somewhere I can get the train. If this helped lower costs I'd be fine with this but probably they'd keep the high price anyway.
Gatwick long-term parking is not expensive if you book in advance. You need to take a slow bus shuttle to the terminal, but it's never more than 15-20 min including waiting time. I've used it a zillion times as I'd rather not give my keys to those meet & greet companies who drive your car 5 miles. It might void insurance and waiting times when you return tend to be over an hour.
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Fun fact: you can get to/from Schiphol by bike.
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